Numberphile
Mile of Pi
What is the millionth digit of pi? (Answer: 1.) Scholars watch a video in the Numberphile Pi series that shows the unfurling of a mile-long banner with a million digits of pi along a runway. The narrator describes some interesting...
Curated OER
Multiplying Decimals
See how easy it is to multiply decimals. This clip shows learners that when you multiply decimal numbers, you multiply the same as you would a whole number, then plug in the decimal point at the end.
Curated OER
Adding Decimals
I'm so glad to hear Duane start this tutorial with the most important tip for adding decimals. He stresses the importance of lining up your decimals before you add. After that it's easy. You just add.
Curated OER
Comparing Decimals
Comparing decimals can be easy. Watch and learn how to line up four decimal numbers vertically and then starting from the left, compare each number in each place value to determine which is largest and which is smallest. This procedure...
Curated OER
Rational and Irrational Numbers
Irrational, rational, and terminating numbers are all covered in this math tutorial. The instructor uses a question from a math test to work through, showing how to compute and evaluate each answer to determine if the number given in...
Khan Academy
MTEL Math Practice Test: 5-8
In this video, covering questions 5-8, Sal demonstrates test-taking skills (reading a question properly, analyzing all possible choices) and pre-algebra-level skills. He guides viewers through problems involving simplifying expressions,...
Khan Academy
MTEL Math Practice Test: 9-11
This MTEL practice video focuses on problems 9-11, which include skill sets such as reading number lines and inequalities. Sal guides viewers through reading the question and working the equations with simple narration and colorful...
Curated OER
How Do You Solve a Decimal Equation Using Subtraction?
Solve this algebraic equation by isolating the variable. In this one-step problem that is done by using the subtraction property of equality. There are decimal numbers in this equation so be sure to line up the numbers according to the...
Curated OER
How Do You Turn a Fraction Into a Terminating Decimal?
Writing a fraction is just another way of writing a division problem. Which means all fractions are then division problems. Fractions can be converted into decimal numbers by doing the division. This fraction can be converted into a...
Curated OER
How Do You Put Fractions and Decimals in Order?
Many young mathematicians skip problems like this because they just don't want to do the work to figure it out. A series of fractions and decimal numbers that they have to put in some order. So they have to do some converting and if long...
Curated OER
How Do You Compare Fractions by Converting to Decimals?
Two fractions with unlike denominators. Compare and figure out which one is greater. There are a couple of ways to do this. This time change the fractions to decimals to compare. Once the values are found, they can also be plotted on a...
Curated OER
What is the Percent Equation?
What number is 40% of 30? Learn the formula and be able to figure out all of the percent problems. The instructor demonstrates the basic formula. Then she shows how and where to plug in the numbers according to what the problem is asking...
Curated OER
What is the Formula for Simple Interest?
I=prt is the formula for interest. What does each variable represent? I =interest, p =amount originally invested, r =rate of interest (usually in percent), t =time. Now all you have to do is plug in the numbers and do the calculations.
Curated OER
How Do You Find a Missing Angle in a Quadrilateral?
Oh no, there is a missing angle in a quadrilateral. Where did it go? It didn't go anywhere, it's just missing the value of the angle. So how do you find that missing value? Use a formula of course. Everything in algebra uses a formula....
Curated OER
How Do You Find the Mode of a Data Set?
What is the mode of a data set? Mean, mode, median. Get confused in remembering which is which? Mode is the number that appears the most times in a data set. So given a data set, arrange the numbers in numerical value from least to...
Curated OER
How Do You Solve a Word Problem Using a Two-Step Equation with Decimals?
A word problem with just one variable. Definitely doable! Identify all the components in this word problem then write an equation. Now solve it using the properties of equality.
Curated OER
How Do You Turn a Percent into a Decimal?
Remember how to convert percentages to decimals? No? Move the decimal to the right? Move the decimal to the left? Need a quick review? Then watch this video.
Curated OER
How Do You Put Fractions, Decimals, and Percents in Order?
A series of fractions, decimal numbers, and percentages that have to be put in some order. Many young mathematicians skip problems like this because they have to do some converting and if long division is involved many definitely skip...
Curated OER
How Do You Turn a Percent Into a Fraction?
Change decimals to percent, fractions to decimals, percentages to fractions, etc. Remember how to do all of these conversions? It gets so confusing. Move the decimal to the right? Make it a fraction over 100? Multiply by? Oh my! So watch...
Curated OER
How Do You Solve a Decimal Equation Using Multiplication?
Solve this algebraic equation in one step by using the multiplication property of equality. Not sure what that property is? Then watch this video and see the instructor work out this problem. These are decimal numbers so make sure to use...
Curated OER
How Do You Solve a Decimal Equation Using Division?
Use the division property of equality to isolate the variable. Then, do long division of decimal numbers to find the solution. Pay attention to moving the decimals. Don't forget to check the solution by plugging it back in to the...
Curated OER
How Do You Use the Formula for Simple Interest?
I=prt is the formula for simple interest. What does each variable represent? I =interest, p =amount originally invested, r =rate of interest (usually in percent), t =time. Now all you have to do is plug in the numbers and do the...
Curated OER
How Do You Multiply Decimals?
Find the product of numbers that have decimals. First, ignore the decimals and multiply the integers. Second, count the place values of the decimals for each value given. Third, add the values together. Fourth, place the decimal in the...
Curated OER
How Do You Figure Out if a Square Root is Bigger than Another Number?
You have been given a square root and need to compare that to a decimal number to find out which one is bigger. How can you make that comparison? One way to do this is to find the square root of the square root number and then compare it...